Offset for log carriers



May 25, 1931. A ms 1,807,086

OFFSET FOR LOG CARRIERS Filed. March 51 1 23 2 Sheets-Sheet l INVENTOR. EPA IE A P542215.

A TTOR NE Y5.

E. A. FERRIS May 26, 1931.

OFFSE T FOR LOG CARRIERS Filed March 51 1933 2 sheets sheet 2 N M w I 2 o r S 3 NM a 2 Mo EVEN K [N VEN TOR.

BY ERVIE A. Fake/s.

A TTORNE Y5.

Patented May 26, 1931 ERVIE A.FERRIS, OF WESTWOOID, CALIFORNIA OFFSET FOR LOG CARRIERS Application filed March 31, 1928. Serial No. 266,250.

My invention relates to improvements in an offset for log carrier, and it consists in the combinations, constructions, and arrangements hereinafter described and claimed.

An object of my invention is to provide an offset for a log carrier which automatically moves a log laterally at the end of the cutting operation, so that the log can be returned for the next out without it interfering with the band saw. The carrier supporting the log is shifted laterally for this purpose, and I provide novel means for accomplishing this as soon as the carrier starts on its return movement. Additional means is provided for causing the carrier to stop and start on its return movement without moving laterally, thus permitting the log to be stopped when partially cut, and to be 9 reversed in its movement without having the saw interfered with by a lateral movement.

A further object of my invention is to provide a device of the type described that has means for taking up the shock caused by a log rolling-upon the carrier into position.

. This means also performs the additional function of moving the carrier back into a position for the next cut when the carrier has been returned to its starting point.

Other objects and advantages will appear in the following specification, and the novel features of my invention will be particularly pointed out in what I hereinafter claim.

My invention is illustrated in the .-:.ac-

companying drawings forming a part of this application, in which: I

shaped wheels 3 and flat flanged wheels 4.

The wheels 3 ride upon a rail5 and this rail Figure 1 is a top plan view of the deguides the carrier. The wheels 41- ride upon a flat rail 6. This is standard construction.

Figure 1 shows how each shaft 2 is threaded at 7 and 8 for receiving lock nuts 9 and 10. These nuts bear against thrust washers 11 and 12, which in turn bear against the end of a bearing 13. An adjustment of the nuts 9 and 10 will correctly position the carrier 1 upon the shafts 2. r

The bearings 13 are connected to each other 50 in pairs by castings 14. These castings carry two cylinders 15 and the carrier carries two cylinders 16 and I will hereinafter refer to s the cylinder 15 as the cushioning cylinder, and the cylinder 16 as an ofiset cylinder.

In the cylinder 15 I mount a cushioning piston 17, see Figure l, and this piston is connected by a rod 18 to the carrier 1.; It will be seen: from this construction that a movement of the piston 17 will move the carrier 1 laterally upon the shafts 2. The cylinders 15 are connected by air pipes 19 to a common main line pipe 20. The pipe 20 car.- rles air under a constantpressure and normally the pistons 17 will keep the carrier in a position where a band saw 21, see Figure 3,wi11 cut through a log 22.

At this point it might be well to note that the pistons 17 act as a cushioning means for w carrier 1 when a log is rolled upon the carrier. Reference tov Figure 3 shows that the log 22 will strike knees 23 of a log holding member. These knees are secured to the carrier and therefore when thelog strikes them it will tend to move the carrier laterally upon the shafts 2. This movement causes the pistons 17 .to move in the'cylinders 15 and partially compress the air within thecylinders. In this way the pistons act asshock absorbing means. When the shock has been absorbed the pressure within the pipes 19 is sufficient to move the carrier'l back into cutting position. The log 22 is held by upper and lower tong dogs 24 and 25'. V

The carrier will remain in the position shown with respect to the shafts 2 during the entire cutting operation. The carrier is moved laterally upon the shafts during its return movement, and is held in this position during the entire movement. 7 The means for and under the same pressure as applied against the first mentioned pistons, whereby said auxiliary pistons will move said carriage laterally upon said shafts.

4. A sawmill carriage comprising a plurality of shafts, a carrier supported by said shafts and having a lateral movement With respect thereto, a common source of air pressure, means controlled by the air pressure for yieldingly holding the carrier against lateral movement, a second means actuated by the air pressure and automatically controlled for exerting a greater pressure against the carrier than that exerted by the first means, said second means moving the carrier laterally.

5. A device of the type described comprising a plurality of shafts, Wheels supporting said shafts, a carrier mounted on said shafts and having a lateral movement with respect thereto, cylinders carried by said shafts, pistons mounted in said cylinders, and being connected to said carrier, means for maintaining a constant pressure of air upon said pistons, auxiliary cylinders, auxiliary pis tons mounted in said cylinders of a larger size than said first named pistons, and means for applying air against said auxiliary pistons and under the same pressure as applied against the first mentioned pistons, whereby said auxiliary pistons will move said carriage laterally upon said shafts, said firstnamed pistons at all times pressing against air under pressure, whereby said carrier can have a slight lateral movement for absorb-ing the shock of receivin a log.

E VIE A. FERRIS. 

